Suisei no Gargantia

7.8

AKA: Gargantia on the Verdurous Planet

Sci-Fi, Adventure, Mecha - 2013 (TV)

While fighting an intense inter-galactic war, a mecha pilot was accidentally warped into a space-time neither he nor the computer of his mecha could recognize. After waking up from a long-time hibernation, he found himself trapped on a planet, with human residents talking in an unknown form of language, using inferior technologies, and -- most shocking to him -- naturally breathable air. (Source: ANN)

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Knock a star off if you don't like sci fi, think this doesn't have enough mecha battles, or don't think you'll be able to handle the background information being a bit scant. Otherwise, this gets a very solid recommendation from me.